Abstract: A controller for determining the location of speakers in a system of speakers configured to play out audio signals received according to a wireless communications protocol. The controller configured is to, for each speaker of the system of speakers, transmit a signal to that speaker comprising an indication of a playout time for playing out an identification sound signal comprising the identification data of that speaker. The controller is configured to receive data indicative of a played out identification sound signal from each speaker as received at least two listening locations, wherein relative positional information about the at least two listening locations is known. For each of the at least two listening locations, the controller determines the locations of the speakers of the speaker system relative to the position of one of the at least two listening locations.